Buster321c 1,010 Posted June 29, 2013 Report Share Posted June 29, 2013 3 off 10 shot strings over a Pro Digital Chronograph.... All weighed and put into breech individually and no deformities,all checked1st 10 shot string directly from storage in gun bag at 16*C into outside air temperature of 19*C...FPS FT/LB591 8.85593 8.91596 9.00598 9.05600 9.13602 9.19599 9.10600 9.13600 9.13600 9.13Then 5 minute break with gun in full sun to pick up radiated heat....Temperature in full Sun 23.5*C647 10.61 This shot went above POI by 4 mildot643 10.48637 10.29638 10.32643 10.48 This shot also went 4 mildots above normal POI646 10.58640 10.39638 10.32 This shot dropped 3 mildots below POI643 10.48637 10.29653 10.89637 10.29638 10.26641 10.42642 10.45640 10.39637 10.29638 10.32646 10.58640 10.39Loaded the 2 magazines and 24 more pellets fired grouping beautifully with no loss of POI... Thoughts ??? 1 Quote Link to post
zini 1,939 Posted June 29, 2013 Report Share Posted June 29, 2013 Me and Davy have had the same results today Craig. Air temp really affects a rifles power. For accurate shooting your rifle needs calibrating at a normal temp for the time of year. We had the same results with our springers. Grease temp resulting in grease thickness and flowidity, air temp and air pressure and location altitude all play a part in POI. Si. 2 Quote Link to post
Buster321c 1,010 Posted June 29, 2013 Author Report Share Posted June 29, 2013 Cheers Si . Sorry , forgot to add , its regged . Quote Link to post
moxy 617 Posted June 29, 2013 Report Share Posted June 29, 2013 What zini says Craig. Which rifle? Quote Link to post
Guest scramble Posted June 29, 2013 Report Share Posted June 29, 2013 Me and Davy have had the same results today Craig. Air temp really affects a rifles power. For accurate shooting your rifle needs calibrating at a normal temp for the time of year. We had the same results with our springers. Grease temp resulting in grease thickness and flowidity, air temp and air pressure and location altitude all play a part in POI. Si. Viscosity 2 Quote Link to post
moxy 617 Posted June 29, 2013 Report Share Posted June 29, 2013 Me and Davy have had the same results today Craig. Air temp really affects a rifles power. For accurate shooting your rifle needs calibrating at a normal temp for the time of year. We had the same results with our springers. Grease temp resulting in grease thickness and flowidity, air temp and air pressure and location altitude all play a part in POI. Si. Viscosity Bighead. Quote Link to post
Guest scramble Posted June 29, 2013 Report Share Posted June 29, 2013 Me and Davy have had the same results today Craig. Air temp really affects a rifles power. For accurate shooting your rifle needs calibrating at a normal temp for the time of year. We had the same results with our springers. Grease temp resulting in grease thickness and flowidity, air temp and air pressure and location altitude all play a part in POI. Si. Viscosity Bighead. Always happy to help 2 Quote Link to post
zini 1,939 Posted June 29, 2013 Report Share Posted June 29, 2013 No problems Craig buddy. It doesn't matter if a rifle is regged or not mate in this scenario. Have you ever heard of people keeping their pcp rifle next to a radiator and the cylinder exploding? The air in the cylinder warms up and expands with the heat. This is the same thing but to a lot lesser degree mate. Warm air from a warm cylinder going into a warm reg will propel your pellet faster. Its well known with gun powder ammunition as well mate. In the military we call it the cold gun scenario. Its well known to artillery soldiers and snipers. We don't use gun power but warm air acts in much the same way. Si. 3 Quote Link to post
zini 1,939 Posted June 29, 2013 Report Share Posted June 29, 2013 Me and Davy have had the same results today Craig. Air temp really affects a rifles power. For accurate shooting your rifle needs calibrating at a normal temp for the time of year. We had the same results with our springers. Grease temp resulting in grease thickness and flowidity, air temp and air pressure and location altitude all play a part in POI. Si. Viscosity Nice mate , that word too LOL Quote Link to post
moxy 617 Posted June 29, 2013 Report Share Posted June 29, 2013 Don't make his head any Feckin bigger Si Quote Link to post
Rake aboot 4,936 Posted June 29, 2013 Report Share Posted June 29, 2013 Seal expansion. Expansion of the regulator material as well causing changes in how it operates. Higher Cylinder pressure would be obvious in an unregged gun, 2 Quote Link to post
Guest scramble Posted June 29, 2013 Report Share Posted June 29, 2013 i would think if you fired the first 10 shot string as fast as you could the second string would be closer to if not bang on your POI. The cylinder would cool much faster but the reg would get hotter???? Quote Link to post
thursodog 353 Posted June 29, 2013 Report Share Posted June 29, 2013 Brilliant thread that chaps, cheers. Quote Link to post
Buster321c 1,010 Posted June 29, 2013 Author Report Share Posted June 29, 2013 The reg is fine , maybe a very fine tweek , but nothing noticable . The pressure in the bottle will increase due the the temperature but the reg should not be affected by that much. So far , you guys aint thinking the same as me .......... But who knows , it could be anything . Quote Link to post
Guest scramble Posted June 29, 2013 Report Share Posted June 29, 2013 The reg is fine , maybe a very fine tweek , but nothing noticable . The pressure in the bottle will increase due the the temperature but the reg should not be affected by that much. So far , you guys aint thinking the same as me .......... But who knows , it could be anything . what are you thinking Bust???? Quote Link to post
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