27 replies [Last post]
Offline
Location: Fort Collins, CO, USA
Joined: 01/05/2007
Posts: 17
Figuring MOA

Most good ballistics programs will produce data accurate within one "click" if you give them the right inputs. I talk about it here:
http://demigod.org/articles/practical-long-range-rifle-shooting-equipment/
(towards the bottom)

If you have a zero and know the drop data in inches at subsequent distances, to get scope adjustments for those distances

Drop in MOA at distance X yards = drop in inches / (1.0472 * X/100)

For 36.5" drop at 500 yards from a 230-yard zero, that's
36.5 / (1.0472*5) = 6.9 MOA drop

cowgal's picture
Offline
Moderator
Location: Colorado
Joined: 03/10/2002
Posts: 1787
Figuring MOA
Don Fischer wrote:
O Might get the chance to go to New Mexico after I retire. Will stop and drag cowgirl and her spousal unit along. Ya got at least a year girl!

Ha ha! I think I'll start calling my husband the "spousal unit" - I like that! lol

I'm game, guess I better get in gear and start practicing.

These new threads have been great, lots of really good info. Thanks guys!

Offline
Moderator
Location: Wa.
Joined: 03/31/2004
Posts: 1300
Figuring MOA

When I was frequenting the range more often than I do at the present. There was a gentleman that would spend hour upon hour shooting the 500 yd target with his LR rifles. He always had his pickup and a box trailer with a complete reloading bench w/accessories and usually three rifles. He had more gear in that trailer than most of us have ever heard of. He would set up at the shooting bench. Fire one round and go back to the trailer to make adjustments.
On one occasion I asked what he was doing. He replied that he was trying to find the load that would give him exactly 3000 fps out of his 6.5/284 (the rifle he was currently shooting) and maintain the accuracy. 3000 fps was optimal for that round. Out of that rifle. With that bullet at 1000 yds. It maintained the speed necessary for stability for the entire flight of the bullet.
That is some downright devotion to the sport. It was quite a routine. I saw him just about every time I was at the range and always working on his loads.

Don
Is that the 6.5-06? I would guess that the 6.5/284 and the 6.5-06 are about the same capacity. Was the bench steady enough to determine how accurate the rifle is.
The range I shoot at, to determine accuracy, has covered concrete benches. The same ones they use for the events. It rains quite a bit and usually at the least convenient time.

Those charts, attached to the rifle, that Zak was talking about are a great way to keep info handy. I made one chart but not quite so handy.

Don Fischer's picture
Offline
Moderator
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3183
Figuring MOA

fuzzybear,

Yes the 6.5-06 and 6.5-284 are so much alike in capacity so there's no practical difference. I like the 06 version because I know I'll always be able to get cases. If I do it again, It'll be a 6.5-270. Then I can do all my cases on 270 cases without all the trimming to make them fit.

The bench is more than steady enough. The only drawback is the third leg takes some getting used to. Been shooting off it a long time tho so I am used to it. The way it is is nice because it's fairly light and with the trird leg that way, your weight get's added to the bench. Braces on the front keep it stable sideways. Table is a bit small tho and I'm to lazy to build a new one right now.
Wish I had a bit more room to set the cronograph up on, it works but takes up to much room.

Here's a group shot while I was doing load developement. I have many like this from several different rifles. Three shot's at 100yds.

Offline
Moderator
Location: Wa.
Joined: 03/31/2004
Posts: 1300
Figuring MOA

If the bench is working for you. Why couldn't you add a hinged extension or just an extension for additional space.
Your photo of the 100yd group didn't come through.
What muzzle velocity are you getting and is it a 140gr sierra?
Like I mentioned in an earlier post. The shooter I spoke with mentioned a muzzle velocity of 3000fps as ideal in the 6.5's for 1000 yds

Don Fischer's picture
Offline
Moderator
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3183
Figuring MOA
fuzzybear wrote:
If the bench is working for you. Why couldn't you add a hinged extension or just an extension for additional space.
Your photo of the 100yd group didn't come through.
What muzzle velocity are you getting and is it a 140gr sierra?
Like I mentioned in an earlier post. The shooter I spoke with mentioned a muzzle velocity of 3000fps as ideal in the 6.5's for 1000 yds

It's a 129gr Hornady at 2929fps. My twist is 1-9 and the 129gr shoots better than the 140's. Hinged extension. HUH! Think I will.

Gonna try the 100yd group again here:

Say's 400yd group but it's 100yd w/old Tasco World Class in tip off mounts. New scope is 4-12 Bushnell in One piece Leupold.

Offline
Moderator
Location: Wa.
Joined: 03/31/2004
Posts: 1300
Figuring MOA

Very nice group. Can you get three to cloverleaf?
Shooting a rifle that has been set up for extreme accuracy is quite the challenge. When you can get all three to touch it's a thrill.
What powder are you using? I have my best loads with slower Hodgdon and Reloder. My 270wsm really likes H1000 with the 140gr accubond.

One of the LR shooters that I know said he was going to experiment with the Nosler Accubonds that they were getting good results. I haven't seen him for a while. So, I have no idea what the results were. At that time Nosler had them in 270, 7mm and 30 cal. This guy goes as far as spinning his bullets to make sure they are perfectly balanced and the ogive is the same.

Don Fischer's picture
Offline
Moderator
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3183
Figuring MOA

I've shot a lot of group's with this rifle and don't know that I could do it on purpose. But have kept it down to under min accuracy to 400yds. Now I'm getting serious tho. Have done clover leafs with my 6.5x55 tho.

Been using H4831SC but recently got some R19 to try. Tried R22 but not much luck with it. Funny thing. I've got about 10,000 Herter 120 primers and they work better than the CCI 200's for me? Have some new stuff to try when the weather breaks. Little hotter and switch to WLR. Backed off a bit and worked back up. The load I'm using now is max but absolutely no pressure signs of any kind. Looking at primers, rim and case head measuremants. Geting a bit of smoke on the shoulder so thin a bit more might help. Find out soon.

Offline
Moderator
Location: Wa.
Joined: 03/31/2004
Posts: 1300
Figuring MOA

If i'm recalling correctly. The shooter that was working at getting his rounds to 3000fps was experimenting with RL19 at the time I had asked. He seemed confident that he would accomplish his goal.

I went to Winchester brass and primers, exclusively, several years ago and have never looked back. I do still have parts of two bricks of CCI's from when I was loading a lot of speer bullets.

Don Fischer's picture
Offline
Moderator
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3183
Figuring MOA

Well I did the switch to WLR primers and worked back up and there's nothing there. One thing I found with the CCI primers, out of 50rds loaded with them, I pierced 4 primers. Absolutely no pressure signs just pierced the primers. Gonna see what I get with these then try the same loads with my Herter primers. For some reason these things have worked great in everything. Wonder who made them. Maybe I don't want to know! George probally made them himself in the garage!

Related Forum Threads You Might Like