I have a model 11 that I rebarrelled at the beginning of the summer to 6.5x47. It shot great until the last two times I have had it out. My load is 38.5 gr of IMR 4350 with 120gr berger target VLDs, over the summer i got three shot groups avg about .35" and had a ten shot group of .815" at 100 yds. The last two times I have shot my three shot groups have been around an inch or so. Any ideas what may be going on? The temp outside was about 55 on the day i shot the ten shot group and the last two times I have shot it it was below 40 if that makes a difference. Shooting off bipods with a sand bag under the rear. Thanks in advance for the help.