I recently purchased a custom 300 AI RUM with load info. I have fired a few of the lods recieved with the gun without out any issue. The owner of the gun stated he reloaded with RL20 which I assumed he ment RL25 after looking at other load data for 300RUM. I reloaded a few of the fire cases, neck sized only with 92 gr RL25. (I confirmed the powder charge by checking the load in the rounds received with the gun). A couple of the cases were tight after firing and 1 I could not extract. I was able to extract the case with light tabs on a the bolt with platic hammer. I took the same case and colored it with a marked and reinsterted the case to see where it was hitting hard. The case is tight approx 1/2" from the head. Is this load too hot or is there another potential problem?