Im with smokepole.but,I would check the lands and groves for potentionaly excessive sabot build-up before changing sabots.I shoot the TMZ 250's and only had one occurance when the bullet was hard to load.The conditions at the time were 90 degrees outside and the sabots where exposed to direct sun and became soft "even more so when met with a charge".Now each and every time I swab the barrel I usethe (Chiefs Proclean Jag)and this tool is used the least and is probley the most important part of my cleaning processthis tool gets into the corners and cleans out any sabotthat may be built up in thelands and groves...this may help