Originally Posted by
Eutectic
MJ,
I went into this testing way back thinking thin and 'super' lube qualities for 'extreme's' base oil. I think that now could be going down the wrong 'slippery' path. I agree with Gear on keeping oils in lower percentages.
My gut says keep the Castor Oil in and polymerize it with the Iso 220 (heavier) mineral base oil in the Stihl oil. Castor Oil hangs tough in heat: hates the cold viscosity wise. Some type of oil formulation is needed to help the Castor and 'season' the bore exactly the same. Tall order that has been our target from the start! I dabble trying to keep barrel deposits the same cold as warmer or at least see a controllable ammunition fix for that first shot. This modified 'Felix' has behaved quite well and I look forward to seeing minus temps. 50 degrees spread so far with NO accuracy issues. (It seems to like the 'lower' side of my testing better for groups; but more sensitive to the cold start.)
I did test my old Winchester Model 92 SRC .25-20 with it. Morning lighting has been nice for my 7"dia. white circle against black background. I can center my smoked bead into it like an eclipse and shoot the tang peep very well (especially for an old guy) Yesterday morning the 'Polybutene Felix' grouped 3/4" on my 85 yard target with NO cold start movement! Will try again this morning. Gun and ammo outside.....soaking ..... about 27F.
Eutectic