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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

Nakihunter
.375 member

Reged: 13/10/07
Posts: 588
Loc: New Zealand

Re: Puzzling behavior sighting in my 375 H&H off of the benc
11/08/08 03:29 PM

Check this old thread from April - http://forums.nitroexpress.com/showflat....true#Post103063

I am repeating my post below.

....FWIW - here are some of my conclusions.

1 If the barrel is not free floated & the rifle is not bedded, the point of impact will change between shooting off hand , off a bench rest, a sticks or off a pack in the field or off your palm cushioning against a rock or a tree.
2 This change in point of impact varies from rifle to rifle. Some will change 3 or 4 inches & others just 0.5 inch. It used to drive nuts until I came to conclusion 1 above.
3 Point of impact will also change between a cold & hot barrel or a dirty & clean barrel - again each rifle is different & some change more than others.
4 Even with bedded & free floated rifles, the point of impact will change if you rest it on a hard surface like a bench rest or a log. The bounce at the time of detonating the primer seems to affect the barrel vibration & shots tend to go high.
5 The change in impact is minimised if the rifle is rested on the magazine just in front of the trigger guard & this hard rest is behind the cartridge / chamber & does not seem to affect impact change as much. If the fore-end is cushioned by the palm over the hard surface it also reduces variance in impact.
6 If you rest the barrel on a shooting stick, the point of impact will change all over the place as the barrel vibration nodes will not be the same for each shot. If you rest the fore-end on a shooting stick, make sure that the stick has a soft pad to absorb vibrations or rest your palm on the stick (if possible).

I would like to hear the views of others with more experience on the matter.

--------------------
Always shoot through the target & not just at it.

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Subject	Posted by	Posted on
Puzzling behavior sighting in my 375 H&H off of the bench	chuck375	10/08/08 05:07 AM
Re: Puzzling behavior sighting in my 375 H&H off of the bench	bigmaxx	10/08/08 05:44 AM
Re: Puzzling behavior sighting in my 375 H&H off of the bench	szihn	10/08/08 06:01 AM
Re: Puzzling behavior sighting in my 375 H&H off of the bench	chuck375	10/08/08 06:32 AM
Re: Puzzling behavior sighting in my 375 H&H off of the bench	szihn	10/08/08 07:59 AM
Re: Puzzling behavior sighting in my 375 H&H off of the bench	Con	10/08/08 10:52 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	ozhunter	10/08/08 06:33 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	hoppdoc	10/08/08 06:49 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	bigmaxx	10/08/08 10:51 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	Tatume	10/08/08 11:20 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	hoppdoc	11/08/08 12:12 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	Ripp	11/08/08 01:26 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	9.3x57	11/08/08 01:32 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	Ripp	11/08/08 04:19 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	9.3x57	11/08/08 06:21 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	Ripp	11/08/08 07:25 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	Paul	11/08/08 12:15 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	Nakihunter	11/08/08 03:29 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	chuck375	11/08/08 11:29 PM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	DarylS	12/08/08 01:51 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	DarylS	11/08/08 06:27 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	chuck375	11/08/08 06:57 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	chuck375	11/08/08 03:15 AM
Re: Puzzling behavior sighting in my 375 H&H off of the benc	9.3x57	11/08/08 01:25 AM

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