Thread: Trying something, Eric Cortina method of load development

Originally Posted by MMC3

Thanks distant stalker for that extra analysis. I will let you know how I get on with the next test batch in a few days.
@R93 - the cold bore first shot velocity difference and clean bore vs fouled bore velocity difference is a common phenomenon. The long-range target stuff that I do is out to 900yds - you get two 'sighters', then (normally) 10 counting shots. The first shot of the day is pretty much always lower vertically, usually more so for a clean bore, due to that velocity difference.

I am aware of the clean bore cold shot. This barrel normally takes 3 rnds from clean to settle and hit POA. Just a bit surprised I am getting a 40fps jump after a fouled barrel cold shot.
I am assuming it is the same principle but have had excellent ES in this rifle over a 5 shot string from cold without a jump in velocity. I am a bit confused as to why it has come up now. However the cold fouled shot over the last year or so has been extremely consistent so no need to worry too much about it for a hunting rifle.

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