Double rifle regulation

[Mountaineer]

I recently purchased a double rifle (O/U). I have knowledge of what it was originally regulated at, but after reloading everything from 200 to 350 grain bullets I have noticed a pattern. The 235 Barnes and 250 grain A-frames appear to be about where it was regulated. The 300 grain partition a bear claw are shoot 8 to 12 inches apart after several different powder tries. and 350 more like 8 to 10 inches. The 250 and 235 are shooting 4 shots within 2.25 inche groups at 100 yards. Has anyone hunted Cape buffalo with either the 235 Barnes or 250 aframe in a 375 H&H? Thanks.

 

[Fixfire]

What make and caliber??

 

[Mountaineer]

Renato Gamba in 375 h&h.

 

[Longwalker]

Those are quite light bullets for hunting buffalo with. But you are getting wonderful groups with them. If I was limited to an accurate .375 and 250 gr. Swift Aframe bullets, I wouldn't exactly feel unarmed, but it's a shame your rifle doesn't like being fed a proper 300 grain bullet. The heavier bullets provide more confidence, especially if you have to break a humerus bone on the way to the vital organs. Those light bullets will most likely kill buffalo just fine, but heavier would be better. Personally I'd be looking for a different rifle or get that one re-regulated by someone competent like JJ Perodeau.

 

[Longwalker]

One more comment ... On second thought, that rifle is a gem! The groups you are getting with light bullets is something only a few double rifle owners ever achieve. Please enjoy your rifle for hunting whatever you like, just realize it's on the light side for buffalo. No real need to sell or re-regulate. It will do OK for buffalo, and will serve as a wonderful "everything else" rifle! Or carry it for plains game, and so have a legal, reasonably capable back up with you if your "primary" big bore dangerous game rifle becomes incapacitated.

 

[Berettaco]

2.25 @ 100 - That’s great!! I probably wouldn’t mess with the regulation. Have you tried a 300 gr in one barrel and a lighter in the other?

 

[Mountaineer]

I have been kicking around the idea of a 350 grain Barnes tsx in the upper and a 250 Aframe in the lower. Thinking back over some outings, I think this could produce sub 4 inch spread at 100 yards. I should do some experimenting at 50 yards to see. The 350 tsx will shoot moa if I shoot 3 shot groups with one barrel. I have also considered having leupold to put a dot on the cross hairs to allow for the height difference, but in the heat of battle I don’t want to think about which trigger for which aiming point. This rifle isn’t for woodchucks.

 

[sureshot375]

How do the 300gr shoot at 50 or 75 yards?

You could get by with only have one barrel right on the money for longer shots.

 

[Hunter-Habib]

I don't recommend using anything lighter than 300Gr weight for hunting Cape buffalo. 270Gr is too light in my experience. 250Gr makes things worse. Cape buffalo die very hard, as it is.