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TAC temperature sensitive? #15389627 11/07/20
Joined: May 2010 Posts: 237 alaska M markak338fed OP Campfire Member
OP markak338fed Campfire Member M Joined: May 2010 Posts: 237 alaska	A couple weeks ago did a run of 250gr Kodiaks for my 356 Winchester, 46gr of TAC with Winchester WLR primers. Sighted in, chronographed at 2280, temp was 50 degrees, grouped fine. Went out yesterday at 25 degrees and group's opened up to over 12in. at 50yds. Switched to 200gr factory load and grouped fine. Is TAC that pressure sensitive, is the WLR primer not hot enough for cold weather? Never had anything like this happen, am at a loss to explain it, happy that discovered this before deer hunting this week!

GB1

Re: TAC temperature sensitive? markak338fed #15390558 11/07/20
Joined: Jul 2001 Posts: 60,172 Likes: 18 Banana Belt, Montana M Mule Deer Campfire Kahuna
Mule Deer Campfire Kahuna M Joined: Jul 2001 Posts: 60,172 Likes: 18 Banana Belt, Montana	TAC can be somewhat temp-sensitive in some cartridge/bullet combos. It was originally designed as a military powder for the 5.56 and 7.62 NATO rounds, the commercial versions of which are the .223 Remington and .308 Winchester. TAC tends to be very temp-resistant in those rounds. “Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck

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