New Old Project - Hayabusa PCP - Mark III Revisited

[rsterne]

Here is the completed .457 rifle, along with the .410 shotgun upper which fits the same lower assembly....



The rifle weighs 10.5 lbs. including the scope.... Tank is a 500 cc, 250 bar tank from England, total reservoir capacity is 640 cc (39 CI)….

Bob

[rsterne]

I mounted the .410 shotgun upper on the Hayabusa today to see what it does with the new SS Valve.... Here is the test load, three 36 cal roundball that weighs a total of 204 gr.... The wad is intended for 1/2 oz. of lead shot (219 gr.), so it should give a pretty good indication of the velocity.... The case is a shortened 2.5" all brass case with the primer pocket drilled out to 3/8", the same size as all the other ports....



The Chrony is a bit reluctant to measure the velocity, throwing low velocity errors (eg. 550 fps) if the wad cup separates early, but discarding the obviously wrong readings I got a three shot average of 850 fps (846, 849, 856)…. That is actually a bit better than I got before, so I'm very pleased.... It works out to 327 FPE, just about what I expected, based on the ratio of bore volumes of the .410 shotgun and .457 rifle....

Bob

[Nvreloader]

Thanks Bob

I also love the 410 bore for quail/rabbitshooting,   

What does it do with shot loads, enough power for Quail/Cottontails etc.

Tia,
Don

[rsterne]

No idea, haven't yet hunted with it.... In fact, so far I haven't even loaded a shell with shot, although I have a bag of # 7.5's here for it....

Bob

[Hobbyman2007]

I’m really impressed with the shotgun Bob . Here in Ontario we can only hunt turkey with shotgun . I’m really contemplating converting one of my Cothran valved guns . Finding the right barrel is going to be tough .

[rsterne]

I don't know if a 1/4" port would deliver enough air, even for a .410.... My valve and ports are 3/8"....

Bob