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Any special concerns working up a load with a dedicated can on it?

teddy12b

Private
Full Member
Minuteman
Dec 22, 2008
290
117
I've never worked up a load for a rifle that has a dedicated can on it. I'm wondering if there are any special concerns I should be aware of in the process. In the past I'd already worked up a load for this rifle that I was very happy with. For me when I was an SD under 7.0 that was great. Recently after putting the can on it I played with my new Garmin chrono and my numbers had blown up using the same recipe.

The rifle in question is a Ruger precision rifle in 338 Lapua with a YHM Bad Larry. I'm using Lapua brass, H1000, Fed GMM primers, and Fort Scott 250gr bullets.