4 replies [Last post]
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Location: Idaho
Joined: 06/01/2004
Posts: 1068
Muzzle Rise with the Heavy Ammo?

Speaking of the Win 70. My main gun for decades is my grandad's Win 70 Feather in 30-06. Through the years I shot mostly (and only) the 165 grain bullet thru it, and mostly for deer. In 2004 I filmed an outfitted hunt of my dad's. He was using a similar weight 30-06 but was shooting the 180 grain. The 180 grain had fantastic effect on his Rocky Mountain Bighorn, and a 5x5 Rocky Elk. I snuck out camp with it one day and got into a situation where I could only afford an instantly lethal shot on a mule deer, and so when the time came - his 180 gr slug did it perfectly. Since then I have switched over to the 180 grain (re-zeroed) and have enjoyed nice lethality in it with my win 70.

Question: I was checking zero this afternoon. With 180 grain slugs I was 1-1/2 inches high at 50, right where I want to be. I decided to crank thru some 55 gr accelerators and 125 grain `low recoil' rounds. They all came in at ZERO at 50.

SO, THE QUESTION: AM I GETTING MUZZLE RISE WITH THE HEAVIER BULLET?

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Location: Colorado
Joined: 11/09/2005
Posts: 166
Muzzle Rise with the Heavy Ammo?

Two factors are at work: 1) A heavier bullet will usually create more recoil and hence more muzzle lift overall. 2) A heavier bullet will usually be moving slower, meaning that the recoil has more time to move the barrel before the bullet exits. The result is that it is normal for a heavier bullet to have a more arched trajectory, which results in higher bullet placement at closer ranges and lower placement at longer ranges.

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Location: Idaho
Joined: 06/01/2004
Posts: 1068
Muzzle Rise with the Heavy Ammo?

Thanks. Yes. At the time I thought it was odd (counter-intuitive) when I switched to the 180s, and they were coming high at 50, but I dismissed it. But then (yesterday) I recalled my handgun days - shooting the 44 (`Dirty Harry' gun), with somewhat similar effect going from light to mag loads. Thanks for your reply - you sorted it out well and concisely. The whole thing reinforces the fact that all the tables, ballistics, etc. - are no subtitute for going out and actually rattling rounds thru your gun.

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Location: Utah
Joined: 03/03/2005
Posts: 383
Muzzle Rise with the Heavy Ammo?

Heavier bullets usually have a higher Point of Impact because they're moving slower and in the barrel LONGER as it naturally rises with recoil. Faster bullets generally shoot lower and slower projectiles tend to shoot higher due to muzzle rise.

Offline
Location: Idaho
Joined: 06/01/2004
Posts: 1068
Muzzle Rise with the Heavy Ammo?

Thanks gang ... our early elk season starts in ... 21 days! Yummmm.

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