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The rifle could be the problem.
Maximum cartridge overall length is 3.7 inches.
The same as 338 Lapua Magnum and 300 Norma Magnum.
Only the "bolt face" (base diameter) is the same as 300 Win Mag.
The SAAMI max COAL for 300 Win Mag is 3.340" and the min for 300 PRC is 3.575" - no common ground.
see https://saami.org/technical-informat...mber-drawings/
So, any WinMag or RemMag rifle can't be just changed to 300 PRC by swapping a barrel.
You would need a longer throw bolt to feed it, preferably full Lapua Magnum length.
Attachment 225449