POI change?
01-31-2008 | 09:18 PM
#1
Thread Starter
Giant Nontypical
Joined: Feb 2003
Posts: 9,085
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From: PA
POI change?
i have a rem 700 SPS 22-250 with a 26" heavy barrel.
i havent shot paper with it since summer time...it was 80-95 degrees and sunny out...gun sitting on a bench in direct sunlight, so it was WARM out...as well as the shells...actually, the ammo never left my consule in my truck so now they are REAL cold...
i zeroed the rifle at 200yd...
say i took it out now, cold ammo, air temp barrel(below freezing...32 degrees down to 0 depends)..if i took it out now, what kind of point of impact change would i be looking at? if any? i know if im going hunting with it, i aughta shoot some paper and make sure its there...dont need a 200yd zero and want to burn up all the ammo anyways...want to head to the range soon either way...just got to thinking about the POI change...with that rifle and scope i SHOULD notice the change even if its pretty minimal...just always wondered how different temps like that effect the POI...might take the gun coyote hunting...will head to the range before that..just wondering where my POI will be in the cold
i havent shot paper with it since summer time...it was 80-95 degrees and sunny out...gun sitting on a bench in direct sunlight, so it was WARM out...as well as the shells...actually, the ammo never left my consule in my truck so now they are REAL cold...
i zeroed the rifle at 200yd...
say i took it out now, cold ammo, air temp barrel(below freezing...32 degrees down to 0 depends)..if i took it out now, what kind of point of impact change would i be looking at? if any? i know if im going hunting with it, i aughta shoot some paper and make sure its there...dont need a 200yd zero and want to burn up all the ammo anyways...want to head to the range soon either way...just got to thinking about the POI change...with that rifle and scope i SHOULD notice the change even if its pretty minimal...just always wondered how different temps like that effect the POI...might take the gun coyote hunting...will head to the range before that..just wondering where my POI will be in the cold
01-31-2008 | 09:54 PM
#2
Nontypical Buck
Joined: Jun 2007
Posts: 1,195
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From: DFW
RE: POI change?
I'd bet money that the POI would be lower than before. The hotter the weather the more pressure you'll see. The cooler the weather the less pressure you'll see. As a reloader and an NRA highpower shooter, I've loaded shells that when shot during the start of the season, when it was cooler, would be perfect. When the weather started to get hot, like August, those same shells that I loaded were cratering primers and at worst case piercing primers.
02-01-2008 | 05:24 AM
#3
Thread Starter
Giant Nontypical
Joined: Feb 2003
Posts: 9,085
Likes: 0
From: PA
RE: POI change?
i thought the hotter temps raised the pressure and would most likely leave me shooting higher than i might be now...just wondered how much it may be...i know my flintlock was a little touchy about the subject...it was clearly high when i shot it in the summer...but when i shot it in the cold weather it was back to normal. it wasnt overly high...but noticeably..
02-01-2008 | 06:22 AM
#4
Giant Nontypical
Joined: Feb 2003
Posts: 6,270
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From: Texas - BUT NOW in Madison County, NY
RE: POI change?
ORIGINAL: mauser06
i have a rem 700 SPS 22-250 with a 26" heavy barrel.
i havent shot paper with it since summer time...it was 80-95 degrees and sunny out...gun sitting on a bench in direct sunlight, so it was WARM out...as well as the shells...actually, the ammo never left my consule in my truck so now they are REAL cold...
i zeroed the rifle at 200yd...
say i took it out now, cold ammo, air temp barrel(below freezing...32 degrees down to 0 depends)..if i took it out now, what kind of point of impact change would i be looking at? if any? i know if im going hunting with it, i aughta shoot some paper and make sure its there...dont need a 200yd zero and want to burn up all the ammo anyways...want to head to the range soon either way...just got to thinking about the POI change...with that rifle and scope i SHOULD notice the change even if its pretty minimal...just always wondered how different temps like that effect the POI...might take the gun coyote hunting...will head to the range before that..just wondering where my POI will be in the cold
i have a rem 700 SPS 22-250 with a 26" heavy barrel.
i havent shot paper with it since summer time...it was 80-95 degrees and sunny out...gun sitting on a bench in direct sunlight, so it was WARM out...as well as the shells...actually, the ammo never left my consule in my truck so now they are REAL cold...
i zeroed the rifle at 200yd...
say i took it out now, cold ammo, air temp barrel(below freezing...32 degrees down to 0 depends)..if i took it out now, what kind of point of impact change would i be looking at? if any? i know if im going hunting with it, i aughta shoot some paper and make sure its there...dont need a 200yd zero and want to burn up all the ammo anyways...want to head to the range soon either way...just got to thinking about the POI change...with that rifle and scope i SHOULD notice the change even if its pretty minimal...just always wondered how different temps like that effect the POI...might take the gun coyote hunting...will head to the range before that..just wondering where my POI will be in the cold
I once owned a Mannlicher/Schoenauer carbine in .270 Win. When I bought this rifle in 1964, I installed aLyman All-American 4X scope on it, and zeroed it to hit 4" high at 100 yards. Every year from 1964 on, until I sold it in 1987, I took it to the range and FIRED 1 SHOT at 100 yards. For all those 23 years, it was still 4" high at 100 yards every time I tested it. One shot was all that was needed to verify that nothing had changed. And it killed deer for me every one of those years also, plus a couple of pretty nice black bears!
02-01-2008 | 08:37 PM
#5
Joined: Jan 2008
Posts: 425
Likes: 0
From: Texas
RE: POI change?
The only thing we can say for sure BOW is that higher temps mean higher pressure, faster burn and slightly increased velocity. Cold weather is naturally the opposite direction. It should be safe to assume that your trajectory will deteriorate as result. But I doubt over say 100 yds that you would notice a great effect. It's got to be more noticible at distance if any of the ballistic tables are to be believed.
