What's the minimum velocity that ensures a clean hole in the target at 20x.

[Vic Thompson]

Thanks for the useful replies to date. I'm only a plinker these days due to "the shakes" so am not too worried about accuracy to the level that most people are, but as I like to get about 200 or more shots off per visit to the range a good shot count per cylinder is useful to me. I'm currently using Hobby pellets and strangely enough they are surprisingly accurate but with the flight characteristics of a wall brick (as are apparently all flathead pellets). If I'm unlikely to get both a nicely cut hole at 20x along with a good shot count, I might as well consider using a round headed pellet with a better BC. That way according to Chairgun I can set my pistols up to get a trajectory that's ok (by my standards) for both 10 and 20x without sight adjustment with only 45fps loss in Velocity over a 20x range rather than the all but 100fps from flatheads. That way I can also reduce the MV for the same terminal velocity and save on shot count.

Vic Thompson.

[RobinC]

Vic

My LP50e compact with standard velocity, punches sharp holes at 25 metres with RWS R10's and is accurate, 20 yds is significantly less, but if you want 200 shots from an LP50 you will be really struggling.

Have Fun
Robin

[Vic Thompson]

Thanks for the latest replies to my posting folks. I know that at the Muzzle my LP50 creates a clean hole in a standard NSRA supplied 20x Target but at 20x doesn't, (they are ragged and torn holes with 20xV est at MV less 100fps). When scoped and shot off the bench even Hobby pellets achieved multiple ten shot groups all cutting or lying within the ten ring. I've done this with several different pellet brands so I guess the barrel and velocity and pellet combination is ok.

So it's ok from that perspective, but without a scoring gauge the targets are not straightforward to scope in one glance. Regarding 200 shots, that's from two cylinders and more or less achievable at present. I can weigh the full and empty cylinders and calculate start and fill pressure with an assumed capacity (as I can't find it as a published figure via the Web). Also, when I can, I'll do a few shots with match and roundhead pellets and measure MV and downrange V over a few tens of yards and see how Chairgun compares to actual measurements.

All a waste of time for someone of my dismal standard but something that interests me just as much as the actual shooting side.

Vic Thompson.

ps : for a full length cylinder the 200 Bar cylinder weight compared to the cylinder weight after 100 shots indicates that the remaining pressure is 101 Bar.

Vic T

[thirdwheel]

Until the pandemic I was shooting Standard and Sport pistol comps at 25m on the turning targets at Bisley with an LP50 and R10 pellets. Scoping the holes is easy as it produces nice sharp holes, you will not get that with domed pellets. I have a full size pistol and will do a complete course of fire on one cylinder - 60 shots plus 5 sighters those that use compacts generally change their cylinders at 30 shots just to be safe. We do not crank up the output as it is not needed and seems to be far more reliable than those using real pistols to do the same thing but they do make bigger holes!

[tufty]

Hi Vic,

My LP50 cuts nice clean holes at 20yds using R10 pistol wadcutter pellets, I confess I don’t know the the MV is set at, but I can get a 60 shot standard pistol match plus sighters out of one cylinder, when the club reopens in December you are welcome to check the MV of my pistol if that would help.

Neale

[Vic Thompson]

Thanks for al of the input everyone, and especially Neale who I'd like to take up on his offer of comparing his pistol against mine as regards MV, target appearance and shot count.

Vic Thompson.