Gun of large period

[M7a7r7k7]

I made a gun, using an interactions from pd-46 guns. The interaction usually gives a new glider and a traffic light. Its period is fairly large, somewhere around 270, but I don't know how to find the exact period. Can someone figure it out or tell me how to find it? Here is the rle of it:

x = 50, y = 62, rule = B3/S23
15bo$13bo2bo$b2o10b5o$b2o10b3ob2o16b2o$14b2obo16bo$15b2o16bo2b2o10b2o$
33bo2bo11b2o$15b2o16bobo$14b2obo16b2o$b2o10b3ob2o$b2o10b5o16b2o$13bo2b
o16bobo$15bo17bo2bo11b2o$33bo2b2o10b2o$34bo$16bo18b2o$16bobo$16b2o9$5b
o$4bo$4b3o5$3b3o$3bo$4bo9$15b2o$15bobo$15bo18b2o$33bo$32bo2b2o10b2o$
14bo17bo2bo11b2o$12bo2bo16bobo$2o10b5o16b2o$2o10b3ob2o$13b2obo16b2o$
14b2o16bobo$32bo2bo11b2o$14b2o16bo2b2o10b2o$13b2obo16bo$2o10b3ob2o16b
2o$2o10b5o$12bo2bo$14bo!

[Kasuha]

Its period is 276. In Jason's gun collection there's older and more tightly packed version of the same:

Code: Select all

x = 54, y = 46, rule = B3/S23
24bo$32b3o3bo$30b5o2bobo12b2o$29b2o3b2o3bo12b2o$24b2obo2b2o3bo2bo$5b2o
12b3o2b2o2bo2bo3b3o$5b2o13b2o6bo$21b3o3b2o2bo3b3o$22bo3bo3b2o3bo2bo$
29b2o3b2o3bo12b2o$22bo3bo3b5o2bobo12b2o$21b3o3b2o3b3o3bo$5b2o13b2o6bo$
5b2o12b3o2b2o2bo$24b2obo4$34b2o5b3o$34bob2ob2ob2o$34bo3b3o3bo$37bo3b3o
$41b3o6$b2o27b2o$b2o26bobo$11b2o18bo21bo$13bo37bobo$2o8b2o2bo37b2o$2o
9bo2bo17bo$12bobo16bo2bo$12b2o16b5o10b2o$29b2ob3o10b2o$12b2o16bob2o$
12bobo16b2o$2o9bo2bo$2o8b2o2bo16b2o$13bo16bob2o$11b2o16b2ob3o10b2o$b2o
27b5o10b2o$b2o28bo2bo$32bo!

Probably the easiest way how to figure out the gun's period is to write down generation numbers when the glider passes certain spot or gets destroyed by an added eater. Or you can add an eater and analyze it as oscillator using Oscillizer